PHP ARRAY SORTING FUNCTIONS - PHP LESSON 15 STUDENTSBLOG100

Generally sorting refers to arranging or ordering data based on some category. In php also sorting functions are used to order the array elements.

Some of the sorting functions are..

• sort() - sort arrays in ascending order in indexed array
• rsort() - sort arrays in descending order in indexed array
• asort() - sort associative arrays in ascending order, according to the value
• arsort() - sort associative arrays in descending order, according to the value
• ksort() - sort associative arrays in ascending order, according to the key
• krsort() - sort associative arrays in descending order, according to the key

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Example program for sort():

• Sort arrays in ascending order 

<?php $var1 = array(1,4,2,3,5); sort($var1); $var2=count($var1); foreach($var1 as $var2) { echo $var2 . "<br>"; } ?>

Output:

1
2
3
4
5

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Example program for rsort():

• Sort arrays in descending order 

<?php $var1 = array(1,4,2,3,5); rsort($var1); $var2=count($var1); foreach($var1 as $var2) { echo $var2 . "<br>"; } ?> Output:

5
4
3
2
1

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Example program for asort():

• Sort associative arrays in ascending order, according to the value

<?php $var1 = array("a"=>"10", "d"=>"30", "c"=>"20", "b"=>"40"); asort($var1); $var2=count($var1); foreach($var1 as $var2) { echo $var2 ."<br>"; } ?> Output:

10
20
30
40

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Example program for arsort():

• Sort associative arrays in descending order, according to the value

<?php $var1 = array("a"=>"10", "d"=>"30", "c"=>"20", "b"=>"40"); arsort($var1); $var2=count($var1); foreach($var1 as $var2) { echo $var2 ."<br>"; } ?> Output:

40
30
20
10

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Example program for ksort():

• Sort associative arrays in ascending order, according to the Key

<?php $var1 = array("a"=>"10", "d"=>"30", "c"=>"20", "b"=>"40"); ksort($var1); $var2=count($var1); foreach($var1 as $var2) { echo $var2 ."<br>"; } ?> Output:

10
40
20
30

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Example program for krsort():

• Sort associative arrays in descending order, according to the Key

<?php $var1 = array("a"=>"10", "d"=>"30", "c"=>"20", "b"=>"40"); krrsort($var1); $var2=count($var1); foreach($var1 as $var2) { echo $var2 ."<br>"; } ?> Output:

30
20
40
10

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